Warren Dank has a lawsuit aganst Sears for deceptive advertising for a flat-screen TV.

A Long Island lawyer on a two-year mission to stop retail giant Sears from fooling consumers with what he calls "bait-and-switch" tactics has sued the chain store for $100 million.

Warren Dank, 41, of Syosset, found his professional and personal life colliding in February 2007, when he went to buy a 46-inch flat-screen TV from Sears' Hicksville store, he said in court papers.

Before paying, Dank handed the clerk two rival companies' ads - expecting to shave up to $800 off his $3,600 Sony purchase under Sears' nationally advertised "price match guarantee," the legal papers claim.

The clerk refused, sending him on a three-store, 50-mile odyssey before Dank found a branch willing to sell him the TV at a discounted price, he said.

Even then, the staffer at Sears' Rego Park, Queens, store would honor only the second-cheapest price, not the rock-bottom price, a difference of $400, legal papers say.

"It's a national policy, but they won't honor it," Dank said. "It doesn't make sense."

Dank filed a class-action suit that accused Sears of deceptive business practices and false advertising, the papers say. A similar suit has been filed in Manhattan Federal Court against retail giant Best Buy.